[
    Program: "Block",
    Block: {
        min: 1,
        of: [
            "Class",
            "Import",
            "Function",
            "Block"
        ]
    },
    Class: {
        series: [
            "class", "Id", "{",
            {
                min: 0,
                of: "ClassMember",
            },
            "}"
        ]
    },
    Import: {
        series: [
            "import", "Id", {
                min: 0,
                of: {
                    sequence: [
                        ".", "Id"
                    ]
                }
            }
        ]
    },
    Function: {
        series: [
            "Type", "Id", "(",
                {
                    max: 1,
                    of: "Parameter"
                },
                {
                    min: 0,
                    of: {
                        series: [
                            ",", "Parameter"
                        ]
                    }
                },
            ")", "Block"
        ]
    },
    Type: "Id",
    Parameter: {
        series: [
            "Type", "Id"
        ]
    },
    Block: {
        series: [
            "{",
            {
                min: 0,
                of: "Statement",
            },
            "}"
        ]
    },
    Statement: {
        of: [
            "FunctionCall",
            "Declaration",
            "Block"
        ]
    },
    FunctionCall: {
        series: [
            "Id", "(", "Value", {
                min: 0,
                of: {
                    series: [ ",", "Value" ]
                }
            }, ")"
        ]
    },
    Declaration: {
        series: [
            "Type", "Id", {
                max: 1,
                of: {
                    series: [ "=", "Value" ]
                }
            }
        ]
    },
    Value: {
        of: [
            "Variable",
            "FunctionCall",
            "Function"
        ]
    },
    Variable: {
        of: [
            "Literal",
            "Id"
        ]
    },
    Literal: {
        of: [
            "StringLiteral",
            "IntegerLiteral",
            "DecimalLiteral"
        ]
    },
    StringLiteral: "/\\\"[^\\\"]*\\\"/",
    IntegerLiteral: "/(\d[xb])\d+/"/
    DecimalLiteral: "/\d*\.\d*/"/
    Id: "/[\w_$~][\w_$~\d]*/"
]